NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, all time — NPA 317
AT&T ENTERPRISES, LLC 41
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2015-07-31 317-744-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2015-05-21 317-598-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C FISHERS IN
2015-03-26 317-820-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2014-12-29 317-820-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2014-09-25 317-929-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2014-09-04 317-360-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C GREENWOOD IN
2014-07-25 317-991-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2014-05-02 317-986-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2014-01-31 317-672-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2011-08-18 317-742-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C PLAINFIELD IN
2011-06-20 317-678-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C NOBLESVL IN
2011-04-25 317-853-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C CARMEL IN
2010-12-20 317-438-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2010-10-22 317-647-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C SHERIDAN IN
2010-10-07 317-480-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C FAIRLAND IN
2010-09-24 317-220-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2010-09-24 317-688-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C CARMEL IN
2010-04-22 317-974-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2010-04-09 317-893-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C GREENWOOD IN
2010-03-29 317-863-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C FISHERS IN
2009-12-18 317-875-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2009-10-20 317-825-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C SHELBYVL IN
2009-10-20 317-830-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C WESTNEWTON IN
2009-09-17 317-280-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2009-04-13 317-377-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2008-10-13 317-295-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2008-05-13 317-623-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C NEWPALSTIN IN
2006-11-03 317-318-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C GREENFIELD IN
2006-11-03 317-855-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C OAKLANDON IN
2006-11-03 317-936-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C CHARLOTSVL IN
2006-11-03 317-973-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ZIONSVILLE IN
2006-10-19 317-563-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C DANVILLE IN
2006-06-19 317-483-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C MOORESVL IN
2006-06-08 317-893-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C GREENWOOD IN
2006-03-13 317-947-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C CUMBERLAND IN
2006-03-10 317-219-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C NOBLESVL IN
2006-03-10 317-286-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C BROWNSBURG IN
2006-01-13 317-742-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C PLAINFIELD IN
2005-03-30 317-537-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C FISHERS IN
2005-03-30 317-669-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C CARMEL IN
2004-10-28 317-449-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C ACTON IN

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.